Especially for use on e-screens in schools the eraser should be adjustable. When I select eraser and just tip the pen on the screen a far to big space is erased at once.
I agree with this, but would like the functionality to be expanded.
Just follow the same paradigm as the pens and highlighter. Pop up a window with a set of sizes and a choice of round or square and a set of colors. If you select a color other than the default white, only that color is erased, or alternatively, only that color isn't erased. I could live with either.